Quanloop is building and running a security‑sensitive investment platform. We are hiring multiple Back-End Engineers (Java) in Budapest to strengthen core services, APIs and backend delivery.

Your home office is Budapest and the role is office‑first.

This is a backend-focused role. You will not be expected to build React UI, but you will partner closely with Front-End engineers and UI Developers (HTML/CSS) and own clean service contracts that make integrations predictable.

Role snapshot

Working model: Office‑first (on‑site).
Hiring basis: Local hiring for the Budapest office location.
Onboarding: Budapest is the home office.
Language: English‑first working language.
Reporting line: You report to a Tech Lead; Tech Leads report into Head of Engineering and/or the CTO.

What you’ll be responsible for

Build and maintain Java services in a microservices environment.
Design APIs and service contracts that make integrations stable and predictable.
Improve performance, reliability and maintainability of backend systems.
Partner with Front-End engineers and UI Developers on integration and delivery sequencing.
Work with Product Owner and QA on scope, acceptance criteria and release readiness.
Partner with Infrastructure on operational constraints and production readiness.
Collaborate with Client Operations and Risk and Compliance on workflows and constraints where relevant.
Contribute to shared standards, code review discipline and practical documentation.

What success looks like in the first 3–6 months

You deliver backend changes that are stable, readable and easy to evolve.
API and service boundaries become clearer and easier for other teams to integrate with.
Production outcomes improve through fewer avoidable issues and better operational readiness.

What we’re looking for

Strong commercial experience building and maintaining production Java systems.
Experience designing and evolving APIs and service interfaces.
Comfortable with code review and shared engineering standards.
Fintech or regulated/high‑scrutiny environment experience is preferred.
Clear written and spoken communication in English.
Comfortable working on site with a team.

Growth opportunity

Some senior hires with both Java and React experience may take on technical leadership scope within delivery teams.

Before you apply

If you want more context before applying, the pages below may be useful:

Benefits and rewards — details on health cover, time off, learning support and role-dependent bonus arrangements
Our offices — information on our office-first model and locations
Teams at Quanloop — an overview of how teams work and where this role sits
Our story — background on the company and the way we work

This is optional reading, but it should give you a better sense of what to expect before you apply.

Seniority assessment

If you want a better sense of how we assess engineering seniority, you can read the pages below before applying:

How we assess seniority — an overview of how practical seniority is assessed in our hiring process
Senior back-end engineer (Java) assessment task — the task used in the technical assessment for this role

Reading them before applying is optional, but some candidates find it useful as a quick check of the expected level.

If you reach the technical interview stage, we ask that you read both pages in advance. The task is discussed during the interview, so candidates are expected to be familiar with it beforehand.

How to apply

Apply with your CV (LinkedIn optional). A short note is welcome, but not required.

Back-End Engineer (Java)